Laser dyeing process of denim fabric

Abstract

The invention discloses a laser dyeing process of denim fabric, which is characterized in that excess liquid is removed after extrusion through a mercerizing tank containing caustic soda, and then thesolution is absorbed into fibers in time through a series of cold metal drying cylinders and stretching under certain tension. The caustic soda absorbed by cotton causes substantial acidic dissociation of hydroxyl groups. The concentration of the inner ion part of the cotton fibers is higher than that of the outer ion part. As water is absorbed by permeation and the fibers swells, considerable pressure builds up within the fibers, causing loss of natural crimping property. After the caustic soda is washed off, no shrinkage occurs and the fibers have a rounder cross-section and consequently ahigher gloss. Mercerized cotton can absorb more dye and present higher dyeing rate. The sectional area of the fibers obtained by the process is increased and is rounder, and the gloss is enhanced; thedye absorption is reduced, and the dye consumption is decreased by 30-50%; the shrinkage rate is reduced, and the dimensional stability is improved; the problem of pollution in the denim dyeing process can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of dyeing, in particular to a denim laser dyeing process. Background technique [0002] In the textile field, in order to increase the surface effect of denim, the commonly used fabric treatment method is to remove the dye by local chemical process for fabric surface treatment, or to realize the old-fashioned treatment of the fabric surface through scrubbing and washing processes, so as to realize The effect required by the cloth surface, but there is a lot of pollution in the implementation of these existing methods, which will have a certain impact on the environment. [0003] Laser CNC laser engraving is a kind of laser equipment connected with laser engraving software, which realizes automatic engraving through the input of artwork, and vaporizes the dye on the surface of denim fabric through CNC laser irradiation, so as to produce image patterns that will not fade on various denim fabrics ; This partia...

AI Technical Summary

Problems solved by technology

[0004] However, when the existing production process is implemented with the above-mentioned laser technology, it cannot achieve relatively clear gradient patterns, virtual slubs, and weave effects. With the improvement of downstream manufacturers and consumers' demand for product quality, the current The production process needs to be improved to meet the current technical needs

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